Pre-poling material
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HCI AT Casing for pipe roofing and drainage
  • Introduction
    The AT - Casing System is a pre-poling pipe roof usedas a support measure before excavation in weak ground condition thought to be soft, orsubsidence-sensitive. The system theory is to put a series of steel pipes on top of the expected excavating face and grouting. The installed pipe roof can form a stable support in the working area by transferring loads in the longitudinal direction and decrease excavation induced deformations.

    The system can increase safety in the working area of tunnel. In conjunction with the PANTEX Lattice
    Girder, steel fabric, HCI Self-Drilling anchors or SN Rock Bolts and shotcret after excavating, it can form a 3-dimension support for the open span of the tunnel.HCI employs the Austria ALWAG-TECHMO AT-Casing System and has more than 20 years experience in operating the system. All of the system components are now manufactured locally in Taiwan. HCI can offer not only the whole system components, but also the technical assistance in filed operation if needed.

    Main Advantages
    ■ Application in weak ground and ground conditions prone to subsidence
    ■ Simple and robust system components can be installed by various drilling machines
    ■ Simultaneous drilling and tubing design can save the installation time and reduce the cost
    ■ Reduction of displacements by an immediate support of the borehole wall during installation
    ■ Flushing water re-circulates inside the casing pipe without deteriorating the surrounding ground condition
    ■ Accurate alignment of the casing tubes due to a minimized annular gap
    ■ Flexibility in drilling depth due to the extendable casing pipes with a standard length of 3 m
    ■ Easy extension of the casing pipes even in constricted space

         

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